I always wanted to visit Guernsey and found a grupon voucher for a day trip. Without checking further I purchased and later realised that we can stay there literally for 4 hours only. I've checked http://www.visitguernsey.com for this trip but it is more for a longer stay.
We leave Poole at 8am and arrive there at 11am. The return boat is leaving at 3:10pm so that leaves us less than 4 hours when counting the boarding procedures.
Originally I wanted to go around the island by bus but this might be too ambitious if we want to have a proper lunch. So the best bet would be staying in St Peter Port.
I appreciate if someone can give me tips what to do and see during this short visit from his/her own experiences.